Several months ago (I think around 3-4) we picked up what we thought were a male and female discus. Our tank is 65gal and has some BN plecos and cories. We didn't want to overstock the tank so we thought we'd try a forced pairing. The male is quite active and perky, always has a lot of full colour. The female however is dark a lot of the time, she doesn't seem as if she's adjusting very well. The back of the tank is black as well as the substrate. She's quite active, eats very well, and is showing no signs of illness, nor has she ever. She and the male get along very well, they're together almost all of the time and they've never shown any aggression towards each other. The male has been trying very hard to woo her for a while but she shows no interest in him.
My main questions are:
1. Does her behaviour lead to the assumption that she is not doing well in a pair and needs other discus?
2. With 11 sterbai, 2 rams, 4 BN plecos, and 1-2 SAEs, can we comfortably fit 3 more discus in that tank with 75% weekly water changes? If not what water volume would be recommended for that stocking? I could ask about putting in a sump.
3. How bad would it be to have 4 discus in there instead of 5 (or 6 gulp, definitely don't think the tank can handle 6)?
We could get rid of some plecos and have only one SAE but it'll be really hard to catch the cories that we would want to get rid of, probably close to impossible.

